Gas burner assembly with adjustment for gas quality



Jan. 21, 1964 A. T. WALSTAD 3,113,493

GAS BURNER ASSEMBLY WITH ADJUSTMENT FDR GAS QUALITY Filed June 6, 1958INVENTOR ALVIN 7'. WALSTAD 53 Attorney United States Patent 3,118,493GAS BURNER ASSEMBLY WITH ADJUSTMENT FUR GAS QUALITY Alvin T. Walstad,Gary, Ind., assignor to United States Steel (lorporation, a corporationof New Jersey Filed June 6, 1958, Ser. No. 740,464 2 Claims. (Q1.158-109) This invention relates to a burner assembly and moreparticularly to a burner for use in the early heating stages of billetheating furnaces consisting of a series of barrel type chambers such asshown in Hess Patent No. 2,638,333, dated May 12, 1953. In burnerspreviously used for this purpose most of the heat is provided byradiation. The heating rate of the previous burners was comparativelyslow and the cost of the burners relatively high.

It is therefore an object of my invention to provide a burner assemblywhich will provide both convective and radiant heat.

Another object is to provide a burner assembly so constructed that theburner tip is located out of the radiation zone.

Still another object is to provide a burner assembly which is soconstructed that there is little scale deposited within the furnacechamber.

A still further object is to provide a low-cost burner assembly whichcan be readily cleaned, replaced and adjusted.

These and other objects will be more apparent after referring to thefollowing specification and attached drawings, in which:

FIGURE 1 is a cross section of a barrel type billet heating furnace withthe burner assembly incorporated therein;

FIGURE 2 is a sectional view showing the details of the burner assembly;

FIGURE 3 is an enlarged view showing the burner tip;

FIGURE 4 is a view taken on the line lV-IV of FIG- URE 3;

FIGURE 5 is a view, similar to FIGURE 3, showing a second embodiment ofthe burner tip; and

FIGURE 6 is a View taken on the line VL-VI of FIGURE 5.

Referring more particularly to the drawings, reference numeral 2indicates the heating chamber of a furnace. An opening 4 is provided ateach end of the furnace chamber 2 through which billets B enter andleave the chamber 2. The chamber 2 is surrounded by a refractory wall 6having a clean-out hole 6 through the bottom thereof and a vent hole 10through the top thereof. A metal shell 12 surrounds the refractory 6 andinsulation 14 may be provided between the metal shell 12 and therefractory 6 where desired. Four burner tunnels 16 also extend throughthe refractory lining 6 and metal shell 12. A refractory ring 18 isprovided on the outside of the furnace at each burner tunnel 16 and issurrounded by a burner mounting 26 which has an opening for receiving apipe 22. The pipe 22 passes through an opening in a mounting plate 24which is attached to the burner mounting 26 in any suitable manner. Anasbestos gasket 26 is provided between the mounting 20 and plate 24. Apipe T 2.8 is threaded on the pipe 22. One run of the T 28 is connectedto a nipple 30 which in turn is connected to an air supply manifold 32by means of an angle 34 and flexible connector 36. A standard packinggland 38 is mounted in the other run of T 28. A pipe 46 passes throughthe gland 33. A burner tip 42 is threaded on the end of pipe 40 withinthe pipe 22. The outer end of pipe 4t is connected to a fuel gasmanifold 44 by means of nipples 46 and 48, flexible connector 5t),

3,118,493 Patented Jan. 21, 1964 elbows 52 and pipe 54. The pipe 54passes through a standard packing gland 56 and a coupling 58 into a pipenipple 66 which is attached to the manifold 44. The burner tip 42consists of a hollow body member 62 having internal threads 64 at itsouter end and a closed inner end 66. A plurality of holes 68 areprovided through the closed end 66. The closed end of the body member 62is frusto-conical with the inner and outer walls thereof being parallel.The angle A of the cone is preferably 118". The axes of the holes 68 areperpendicular to the walls of the inner end 66. Three fins 70 are weldedto the outside of the body 62. The fins '76 extend longitudinally of theburner tip 42 at an angle of preferably 45 with the axis of the burnertip 42. The fins 70 extend from the body portion 62 to the inner wall ofthe pipe 22 so that the tip 42 is centered in the pipe 22. Those partsof the assembly subject to heat are preferably made of a heat resistantsteel alloy. Gaskets may be provided throughout the assembly wheredeemed desirable.

FIGURES 5 and 6 show a slight modification of the burner tip in whichfour fins 72 are used instead of three fins. The fins 72 are arrangedlongitudinally of the burner tip at an angle of approximately l4 /2 tothe axis of the burner tip.

The operation of the burner is as follows:

Air, oxygen or a mixture thereof travelling at a high velocity passesinto the pipe 22 around the pipe 40. Fuel gas passes through the pipe 4%into the burner tip 42 and out through the holes 68. The fins 76 or '72create turbulence in the air. This turbulence causes intimate mixing ofthe air and gas in the burner tunnel 16 and also results in a turbulentflow of the products of combustion in the furnace chamber 2. Theproducts of combustion sweep over the billets B so that the billets areheated by this convective heat as well as by radiant heat from the wallsof the chamber 2. The direct impingement of the hot combustion gases onthe cold billets B also provides an effective method of removing scalefrom the billets. The scale dropping from the billets has a free fallthrough the clean-out opening 8 which tends to reduce the amount ofbuildup on the refractory lining directly above cleanout opening 8.

The arrangement of the glands 38 and 56 permits quick and easyadjustment of the emersion depth of gas tip 42 within the tunnel 16 toget the best mixing and combustion regardless of the type of gas used.

By loosening gland 56 and removing gland 38 the complete assembly may beeasily removed for cleaning, repairs, or replacement without disturbingthe main mounting assembly.

While two embodiments of my invention have been shown and described itwill be apparent that other adaptations and modifications may be madewithout departing from the scope of the following claims.

I claim:

1. A burner assembly comprising a first conduit having a substantiallyuniform inside diameter, a T attached to the rearward end of said firstconduit and having a threaded opening in axial alignment with said firstconduit and a side inlet, means for delivering oxygen containing gas tosaid side inlet, an axially movable burner tip mounted within said firstconduit adjacent the forward end thereof, a plurality of fins mounted onthe outside of said burner tip and extending substantially to the innerwall of said first conduit, said fins extending longitudinally of saidburner tip at an angle to the axis thereof, a packing gland supported insaid threaded opening, a second conduit extending through said packinggland, said T and said first conduit, means attaching said burner tip tosaid second conduit, a fuel container having a second threaded openingtherein, a second packing gland supported in said second threadedopening, a third conduit generally parallel to said second conduitmounted in said second packing gland, and a fourth conduit connectingsaid second and third conduits, said second and third conduits beingaxially movable in their associated packing glands so as to positionsaid burner tip at the desired axial position.

2. A burner assembly comprising a tunnel, a first conduit of smallerdiameter than said tunnel leading into said tunnel, said conduit havinga substantially uniform inside diameter, a T attached to the rearwardend of said first conduit and having a threaded opening in axialalignment with said first conduit and a side inlet, means for deliveringoxygen containing gas to said side inlet, an axially movable burner tipmounted within said first eonduit adjacent the forward end thereof, aplurality of fins mounted on the outside of said burner tip andextending substantially to the inner wall of said first conduit, saidfins extending longitudinally of said burner tip at an angle to the axisthereof, a packing gland supported in said threaded opening, a secondconduit extending through 4 said packing gland, said T and said firstconduit, means attaching said burner tip to said second conduit, a fuelcontainer having a second threaded opening therein, a second packinggland supported in said second threaded opening, a third conduitgenerally parallel to said second conduit mounted in said second packinggland, a fourth conduit connecting said second and third conduits, saidsecond and third conduits being axially movable in their associatedpacking glands so as to position said burner tip at the desired axialposition.

References Cited in the file of this patent UNITED STATES PATENTS982,836 Ley et al Jan. 3], 1911 1,352,351 Byers Sept. 7, 1920 1,493,584Wills May 13, 1924 2,183,596 Trinks Dec. 19, 1939 2,276,131 Wiant Mar.10, 1942 2,855,033 Furczyk Oct. 7, 1958

1. A BURNER ASSEMBLY COMPRISING A FIRST CONDUIT HAVING A SUBSTANTIALLY UNIFORM INSIDE DIAMETER, A T ATTACHED TO THE REARWARD END OF SAID FIRST CONDUIT AND HAVING A THREADED OPENING IN AXIAL ALIGNMENT WITH SAID FIRST CONDUIT AND A SIDE INLET, MEANS FOR DELIVERING OXYGEN CONTAINING GAS TO SAID SIDE INLET, AN AXIALLY MOVABLE BURNER TIP MOUNTED WITHIN SAID FIRST CONDUIT ADJACENT THE FORWARD END THEREOF, A PLURALITY OF FINS MOUNTED ON THE OUTSIDE OF SAID BURNER TIP AND EXTENDING SUBSTANTIALLY TO THE INNER WALL OF SAID FIRST CONDUIT, SAID FINS EXTENDING LONGITUDINALLY OF SAID BURNER TIP AT AN ANGLE TO THE AXIS THEREOF, A PACKING GLAND SUPPORTED IN SAID THREADED OPENING, A SECOND CONDUIT EXTENDING THROUGH SAID PACKING GLAND, SAID T AND SAID FIRST CONDUIT, MEANS ATTACHING SAID BURNER TIP TO SAID SECOND CONDUIT, A FUEL CONTAINER HAVING A SECOND THREADED OPENING THEREIN, A SECOND PACKING GLAND SUPPORTED IN SAID SECOND THREADED OPENING, A THIRD CONDUIT GENERALLY PARALLEL TO SAID SECOND CONDUIT MOUNTED IN SAID SECOND PACKING GLAND, AND A FOURTH CONDUIT CONNECTING SAID SECOND AND THIRD CONDUITS, SAID SECOND AND THIRD CONDUITS BEING AXIALLY MOVABLE IN THEIR ASSOCIATED PACKING GLANDS SO AS TO POSITION SAID BURNER TIP AT THE DESIRED AXIAL POSITION. 